I have a bolt in mine. It's nice to know that a 6mm will work. I expected 5mm since the 1/4" bolt I had nearly fit. You should use a grade 8 bolt, and if you can find one- nylon locking nut. Jam-nutting is fine, but a single nut and red thread lock would be acceptable.
What you're really looking for is called a spring pin. You'll remember that the Autozone rolled pin didn't look the same as what you took out of there. Yours would've been a harder steel thinner steel rolled several times around itself. Autozone's rolled pin would look like a round pin with a gap in it- one piece of metal.
I personally would like to replace the part with the correct spring pin, but a bolt is acceptable if it's a high strength or hardness. SS is the hardest, but something like a 10.9 or grade 8 would be hard enough and maybe not damage the shift tower. Stick with the bolt IMO.
Thanks again for letting me know a 6mm would work. BTW I used a cap screw (allen head) instead of a bolt. That made it easier to work.
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